Furnace wall



May 13, 1952 T. H. SHERMAN FURNACE WALL.

Filed Maron 29, 1947 Patented May 13, 1952 FURNACE WALL Tracy H. Sherman,

South Nyack, N. Y., assigner to Foster Wheeler Corporation, New York, N. Y., a corporation of New York Application March 29, 1947, Serial No. 738,125

This invention relates to furnaces and more particularly to furnace walls.

The present invention provides a furnace wall structure in which the refractory elements thereof are so supported that there is a minimum of tortional stress on said refractory elements and the wall is readily constructed without the necessity of cutting, fitting or otherwise shaping said elements during the erection of the furnace. The supporting structure requires but a minimum of metallic structure per foot of wall.

This invention further provides a wall comprising a plurality of adjacent sections in which the sections are locked in relationship to one another so as to prevent overturning of the wall.

The present invention also provides a furnace wall construction for use with furnaces having extremely high temperatures, the supporting structure of said Wall being protected against intense heat and adequately air-cooled.

This invention further provides a furnace wall using standard elements and having a minimum of specially shaped parts which wall is easily and readily repaired. The wall of the present invention may be constructed to a desired thickness without changing the shape of said specially shaped parts. The width of the specially shaped parts are independent of the width of the wall.

The invention will be understood from the following description when l considered in connection with the accompanying drawing forming a part thereof, and in which:

Fig. 1 is a horizontal sectional View of a portion of the furnace Wall of the present invention;

Fig. 2 is a vertical sectional view taken on the line 2-2 of Fig. l but on an enlarged scale, and

Fig. 3 is a horizontal sectional view taken on the line 3-3 of Fig. 2.

Like characters of reference refer to like parts throughout the several views.

Referring to the drawing, Fig. l, the reference numeral Il] designates a furnace chamber surrounded by furnace walls. As shown, a portion of the end wall is designated by the reference numeral II, while a portion of a side wall is designated by the reference numeral I2. The end wall opposite end wall II and the side wall opposite side wall I2 are not shown but would be constructed in the manner similar to the walls I I and I2, as hereinafter described.

The walls II and I2 comprise a plurality of horizontally spaced, vertically extending I-shaped girders or buckstays I3. The girders I3 normally extend from the top to the bottom of the wall and have secured thereto by Welding or other means at vertically spaced points along their length, right-angular shaped metallic supports I4 the vertically spaced supports of each of the girders being in the sa-me horizontal plane as the supports on the other girders. One leg I5 of support I4 is secured to the inner leg I6 of the girders I3, while the other leg I5 of member I4 extends inwardly toward the furnace chamber. Leg I5 of members I4 have an upper surface I 1 and a lower surface I8. An angle bar I9, which extends longitudinally of the wall throughout its length, is supported by the members I4 in the same horizontal plane on the various girders, said angle bar having an upwardly extending leg 20 and a leg 2| which extends inwardly toward the furnace chamber at right angles to the leg 20. Angle bar I9 is secured to the various members I4 on buckstays I3 by welding or any other desired means so that the surface 22 of the leg' 2| abuis the surface I'I of the legs I5 of members I4.

The buckstays I3, members I4 andv angle bar I 9 provide a supporting structure for the tile-or refractory elements of the Wall of the present invention. The refractory elements consist of an upper refractory element 23 having an upper flat surface 24 and a longitudinally extending slot 25 adapted to receive the leg 2U of angle bar I9 in the bottom surface of said element. The bottom of element 23 has a downwardly projecting portion 26 (Fig. 2) which engages the upper surface 2I of angle bar I9 and is of substantially the same Width as said leg. The element 23 has an inwardly extending portion 2l at the inner side of portion 26 and also an outer portion 21', the portions 2'I and 21 being at opposite sides of the downwardly projecting portion 26. A lower refractory element 28 is positioned beneath the element 23 and is substantially L-shaped having a vertically extending leg 29 which projects upwardly to a point closely adjacent the portion 21 of element 23. Element 28 has a horizontally extending leg 30 `with an upper surface 3| which normally is in spaced relationship with under surface I8 of members I4 so as to permit expansion of the portion of the Wall below members I 4 toward said member. The surface 3| of element 28 has apertures 32 therein adapted to receive pins 33 which are welded or otherwise secured to leg 20 of angle bar I9 at longitudinally spaced points. The element 28 rests upon a plurality of lower tiles 34 which are placed one on tcp of the other, the lowermost of which tiles rest upon the refractory element 23 which is supported by another angle bar I9 which in turn is supported by members I4 secured to buckstays I3 in a horizontal plane lower` than the horizontal plane oi the first-mentioned angle bar S9. it will be noted that since downwardly projecting portion 25 of element 23 rests upon the upper surface of leg 2i of the angle bar i5 the lower surface of outer portion 2' is held in spaced relationship with surface I7 of member It thereby forming an air space 35 which extends longitudinally of the walls so that circulation of air adjacent the angle bar I9 and members Irl is permitted thereby cociing the supporting members of the wall.

The walls are bounded on the outer side thereof by a metallic casing 3S and a layer of inn sulating material 3'I is provided between the casing 36 and tiles 34. Air settingY cementv 38 is applied between adjacent surfaces of the tiles and also between the adjacent vertically ex=- tending surfaces of leg 29 and portion 2% of said elements respectively so that adjacent tiles will be secured together thereby forming unitary wall sections. Between the upper surface of leg 29 and the adjacent surface of portion 2! of refractory elements 28 and 23 respectively asbestos fiber packing te is inserted so that said space will be filled and at the same time expansion of the lower wall section will be permitted. e

In constructing the furnace wall of the present invention, the angle members lf3 are welded to the inner leg I5 of girders I3, said angle members being secured at vertically spaced points along each of the girders with angle members ofi adjacent members in the same horizontal plane. The angle bar I3 is then placed so that it issupported by the leg I5 of members Id in spaced relationship with casing 3B inwardly toward the furnace chamber, the under surface 22 of the leg 2| of angle bar I9 abutting upper surface I'I of leg I6 of the members I4. The

angle bar is then attached to said members by weldingor any other desirable means. Refractory element 23 'is placed in position so that downwardly projecting portion 2t thereof rests upon upper surface 2l of angle bar IS and upwardly extending leg 20 extends into slot 25 in element 23. Tiles 34 are then stacked on element 23 upwardly to a point short of under surface I8V of leg I6 of a member I4 in the horizontal plane next above the horizontal plane of rst-mentioned member I4. Refractory elementr28l is placed to rest upon the uppermost tile 3'4 and so that upper surface 3l of said tile is in spaced relationship with under surface it of last-mentioned member I4 so that there is space for expansion of the lwall section. Other "f wall sections are constructed by repeating the above described operation, each of said sections being supported by angle bars I9 extending in spaced horizontal planes which bars are supported by a plurality of members I4 secured to beams I3. Y

Since changes may be effected in the form of the'invention selected for disclosure without departing from the principles thereof, it will be understood that the invention is not to be limited excepting by the scope of the appended claims.

What is claimed is:

l. In a furnace wall comprising a lining of heat insulating material having outer and inner surfaces, exterior supporting means comprising a plurality of horizontally `spaced vertically extending buckstays adjacent the outer surface of said. lining, means for supporting the lining by the exterior supporting means comprising an angle bar extending in a. substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg and being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, and inverted L-shaped bracket supports for the angle bar associated with theV buckstays and said bar, the brackets and buckstays being of substantially equal width, the angle bar being positioned on one leg of the brackets so that said plane in which the vertical leg of the angle bar extends is also intermediate the buckstays and the innermost edge of said brackets.

2. In a furnace Wall comprising a lining of heat' insulating4 material having outer and inner surfaces, exterior supporting means comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, meansfor supporting the lining by the exterior supporting means comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg and being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediateA said inner and outer surfaces of the lining, and inverted L-shaped bracket supports for'the angle bar, said brackets being of substantially the same width asY the buckstays andv comprising members extendingV in planesA substantially at a right angle to onev another, one of said members being secured to a buckstay and the other member being secured to the. horizontally extending leg of the angle bar, the. support and the angle bar being so positioned in relationship to one another that said horizontally extending leg rests upon and is` supported by said other member and the vertically extending leg projects upwardly intermediate the innermost and outermost edges of said other member of the bracket.

3. A furnaceY wall comprising. a lining with an inner and outer surface; said lining being of refractory bricks, exterior` supporting means adjacent the outer surface,- means for supporting the lining by the exterior supporting means comprising an angle bar extending in a substantially horizontal plane and supported by the exterior supporting means, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horlzontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of the horizontally' extending leg and the inner side of said exterior supporting means, the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate. said inner and outer surfaces of the lining, a base brick engaging said horizontally extending leg inwardly of said vertically extending leg from a point adjoining the vertical leg, said base brick extending in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said outerrsurface to thereby form'a longitudinally extending space adjacent said'verztical leg on the side thereof toward the outer side of the lining, and a plurality 4of spaced pins secured to said vertically extending leg and projecting downwardly into the lining.

fl. A furnace wall comprising a lining of refra'ctory bricks, said lining having an inner and outer surface and being in sections, the sections #having an upper longitudinally extending edge Vand a lower longitudinally extending edge, exterior supporting means adjacent the outer surface, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising an angle bar` extending in a substantially Atlie'inner side of said exterior supporting means,

the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, a longitudinally extending row of base bricks forming the lower longitudinal Vedge of a section, the base bricks engaging said horizontally extending leg inwardly of said vertically extending leg from a point adjoining the vertical leg, said base bricks extending in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending space adjacent said vertical leg on the side thereof toward the outer side of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the horizontally extending leg of the support next above said one support, and a plurality of spaced pins secured to said angle bar and projecting downwardly into said bricks of the upper longitudinal edge of a section.

5. A furnace wall comprising a lining of refractory bricks, said lining having an inner and outer surface and being in sections, the sections having an upper longitudinally extending edge and a lower longitudinally extending edge, exterior` supporting means adjacent the outer surface comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of thehorizontally extending leg and the inner side of saidv exterior supporting means, the

angle bar being so positioned in relationship to the lining that said vertical leg extends in a ver- "tical plane intermediate said inner and outer survfaces of the lining, supports for the angle bars comprising members extending in planes subs'tantially at a right angle to one another, one of said members being secured to a buckstay and the othermember being secured to the horizontally extending leg of the angle bar, the supports and the angle bars being so positioned in relationship to one another that said horizontally extending leg rests upon and is supported'by said other member, a longitudinally extending row of base bricks forming the lower longitudinal edge 'of a section, the base bricks engaging said horizontally extending leg inwardly of saidl vertically extending leg from a point adjoining the vertical leg, said base bricks extending .in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending space adjacent said vertical leg on the sided thereof toward the outer side of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the horizontally extending leg of the support next above said one support, and a plurality of spaced pins secured to said vertically extending leg and' projecting downwardly into the lining.

a lower longitudinally extending edge, exterior supporting means adjacent Vthe outer surface comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of the horizontally extending leg and the inner side of said exterior supporting means, the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, supports for the angle bars comprising members extending in planes substantially at a right angle to one another, one of said members being secured to a buckstay and the other member being secured to the horizontally extending leg of the angle bar, the supports and the angle bars being so positioned in relationship to one another that said horizontally extending leg rests upon and is supported by said other member, a longitudinally extending row of base bricks forming the lower longitudinal edge of a section, the base bricks engaging said horizontally extending leg inwardly of said vertically extending leg from a point adjoining the vertical leg, said base bricks extending in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said 4outer surface to thereby form a longitudinally extending space adjacent said vertical leg on the side thereof toward the outerside of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the horizontally extending leg of the support next above said one support, a plurality of spaced pins secured to said vertically extending leg and projecting downwardly into the lining, and a metallic casing along the outer side of said lining.

7. A furnace wall having a lining with outer and inner surfacesI the lining comprising a plurality of sections with an upper longitudinally extending edge and a lower longitudinally extending edge, said sections being of heat insulating material, exterior supporting means adjacent the outer surface, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising a member extending in a substantially horizontal plane and supported by the exterior,v supporting means, each of said members -said one support, and a plurality of longitudinally spaced pinsV associated with said supports and projecting downwardly therefrom into the lining. 8. A furnace wall having a lining with outer and inner surfaces, the lining comprising a plurality of. sections with an upper longitudinally extending edge and a lower longitudinally extending edge, said sections being of heat insulating material, exterior supporting means adjacent the outer surface, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising a member extending in a substantially horizontal plane and supported by the exterior supporting means, each of said members, having another member associated therewith and projecting in a substantially vertical plane at a point intermediate said outer and inner surfaces of the lining, saidlower longitudinal edge of a section engaging one of the first-mentioned members and having a recess therein positioned to receive the other member of said supports, the upper longitudinal edge of a section of the lining extending closely adjacent the support next above said one support, at least one of the longitudinal edges of a section having a longitudinal projection inwardly of said horizontal member of the supports and extending in a general vertical direction a distance to overlap said horizontal member and the adjacent longitudinal edge of an adjoining sectionand a plurality of longitudinally spaced pins associated with said supports and projecting downwardly therefrom into the lining.

9. A furnace wall having a lining` with outer and inner surfaces, the lining comprising a plurality of sections with an upper longitudinally extending edge and a lower longitudinally extending edge, said sections being of heat insulating material, exterior supporting means adjacent the outer. surface, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising a member extending in a substantially horizontal plane and supported by the exterior supporting means, each of said members having another member associated therewith and projecting in a substantially vertical plane at a point intermediate said outer and inner surfaces of the lining, said lower longitudinal edge of a section engaging one ci the first-mentioned members inwardly of the other member associated therewith and extending to a point adjoining'said other member but short of engagement with said one of the first-mentioned members outwardly of said other member to thereby form a longitudinally extending space adjacent said other member along the outer side of the lining, the upper longitudinal edge of said section of the lining extending closely adjacent the support next above said 'one support at least one of the longitudinal edges f a section having a longitudinal projection inwardly of said horizontal member of the supports and extending in a general vertical direction a distance to overlap said. horizontal member and the adjacent longitudinal edge of anV adjoining section, and a plurality of longitudinally spaced pins .associated with said supports and projecting downwardly therefrom into the lining.

1G. A furnace wall comprising a lining of refractory bricks, said lining having an inner and outer surface and beingr in sections, the sections having an upper longitudinally extending edge and a lower longitudinally extending edge, exterior supporting means adjacent the outer surface, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising a member extending in a substantially horizontal plane and supported by the exterior supportingr means, each of said members having another member associated therewith and projecting in a substantially vertical plane at a point intermediate said outer and inner surfaces of the lining, a longitudinally extending row of base Y bricks forming the lower longitudinal edge of a section, the base bricks engaging one of the rstmentioned members inwardly of the other member associated therewith and extending to a point adjoining said other member but short of engagement with said one of the first-mentioned members outwardly of said other member to thereby form a longitudinally extending space adjacent said other member along the outer side of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the support next above said one support, the base bricks and the bricks of said upper longitudinal edge extending inwardly a distance greater than the horizontally extending member of said supports, the base bricks having a longitudinally extending inverted L-shaped recess along the innermost edge thereof and the bricks of said upper edge having a longitudinal projection extending upwardly and into' the L- shaped recess of the base bricks of an adjoining section, and a plurality ofv longitudinally spaced pins secured to said supports and extending downwardly into the bricks of the upper longitudinal edge of a section.

ll. A furnace wall comprising a lining with an inner and outer surface, said lining being of refractory bricks, exterior supporting means adjacent the outer surface, means for supporting the lining by the exterior supporting means comprising an angle bar extending in a substantially horizontal plane and supported by the exterior supporting means, the angle bar having a substantially vertically extending leg and asubstantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of the horizontally extending 'leg and the' inner side of said exterior supporting means, the angle' bar being so positioned in a relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, a base brick engaging said horizontally extending leg inwardly of said vertically extending leg from a point adjoining theY vertical leg, said base brick extending in spaced relationship with the plane of the horizont-al leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending spacey adjacent said vertical leg on the side thereof toward the outer side of the lining, and a plurality of projections longitudinally spaced from one another on said angle bar and extending downwardly into the lining.

12. A furnace wall comprising a lining of refractory bricks, said lining having an inner and outer surface and being in sections, the sections having an upper longitudinally extending edge and a lower longitudinally extending edge, exterior supporting means adjacent the outer surface comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of the horizontally extending leg and the inner side of said exterior supporting means, the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, supports for the angle bars comprising members extending in planes substantially at a right angle to one another, one of said members being secured to a buckstay and the other member being secured to the horizontally extending leg of the angle bar, the supports and the angle bars being so positioned in relationship to one another that said horizontally extending leg rests upon and is supported by said other member, and a longitudinally extending row of base bricks forming the lower longitudinal edge of a section, the base bricks engaging said horizontally extending leg inwardly of said vertically extending leg and from a point adjoining the vertical leg, said base bricks extending in spaced relationship with the plane of the horizonal leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending space adjacent said vertical leg on the side thereof toward the outer substantially at a right angle to one another, one of said members being secured to a buckstay and the other member being secured to the horizontally extending leg of the angle bar, the supports and the angle bars being so positioned in relationship to one another that said horizontally extending leg rests upon and is supported by said other member, and a longitudinally extending row of base bricks forming the lower longitudinal edge of a section, the base bricks engaging said horizontally extending leg inwardly of Ysaid vertically extending leg from a point adjoining the vertical leg, said base bricks extending in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending space adjacent said vertical leg along the outer side of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the horizontally extending leg of the support next above said one support at least one of the longitudinal edges of a section having a longitudinal projection inwardly of said horizontal member of the supports and extending in a general vertical direction a distance to overlap said horizontal member and the adjacent longitudinal edge of an adjoining section.

la. A furnace wall comprising a lining of refractory bricks, said lining having an inner and outer surface and being in sections, the sections having an Lipper longitudinally extending edge and a lower longitudinally extending edge, exterior supporting means adjacent the outer surface comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said vsupports comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the verticalside of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the horizontally extending leg of the support next above said one support.

13. A furnace wall comprising a lining of refractory bricks, said lining having an inner and outer surface and being in sections, the sections having an upper longitudinally extending edge and a lower longitudinally extending edge, ex-

terior supporting means adjacent the outer surface comprising a plurality of horizontally spaced vertically extending buckstays adjacent the outer surface of said lining, a plurality of supports extending in vertically spaced substantially horizontally extending parallel planes, each of said supports comprising an angle bar extending in a substantially horizontal plane, the angle bar having a substantially vertically extending leg and a substantially horizontally extending leg, the horizontally extending leg projecting inwardly of said exterior supporting means, the vertically extending leg being disposed intermediate the inner end of the horizontally extending leg and the inner side of said exterior supporting means, the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, supports for the angle bars comprising members extending in planes ly extending leg being disposed intermediate the inner end of the horizontally extending leg and the inner side of said exterior supporting means, the angle bar being so positioned in relationship to the lining that said vertical leg extends in a vertical plane intermediate said inner and outer surfaces of the lining, supports for the angle bars comprising members extending in planes substantially at a right angle to one another, one of said members being secured to a buckstay and the other member being secured to the horizontally extending leg of the angle bar, the supports and the angle bars being so positioned in relationship to one another that said horizontally extending leg rests upon and is supported by said other member, a longitudinally extending row cf base bricks forming the lower longitudinal edge of a section, the base bricks engaging said horizontally extending leg inwardly of said vertically extending leg from a point adjoining the vertical leg, said vbase bricks extending in spaced relationship with the plane of the horizontal leg outwardly of said vertical leg to said outer surface to thereby form a longitudinally extending space adjacent said vertical leg along the outer side of the lining, the upper longitudinal edge of said section of the lining being formed of a longitudinally extending row of refractory bricks closely adjacent the hori- 11 zontally extending leg of the support next above said one support, at least one of the longitudinal edges of a section having a longitudinal projection inwardly of said horizontal member of the supports and extending in a general vertical direction a distance to overlap said horizontal member and the adjacent longitudinal edge of an adjoining section, and a plurality of spaced pins secured to said vertically extending leg and projecting downwardly into the lining.

TRACY H. SHERMAN.

REFERENCES CITED The following references are Yof record in the iile of this patent:

UNITED STATES PATENTS Number Nam-e Date s Liptak Aug. 16, 1927 Allen June 19, 1928 Bennett Apr. 2 6, 1932 Hartland June 7, 1932 Nygaard Feb. 27, 1934` Young Feb. 6, 1945 

